If you are not claiming your son as a dependent then go to My Info and delete his information.
Your question began with referring to a "dependent". You have provided no information about your son. We do not know his age, whether he is a full-time student somewhere (even overseas), if he has income of his own, etc. etc. etc. We could be more helpful if you would provide some information.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
